Certificate of correction



k of high pressure. erable application for loading coils of the Patented Sept. 20,

UNITED ST TES P T NT-y or-FICE PHILIP matron BOSEIBY, or maroon, manual), assren'on are amen-no mn- IPHONE MANUFAGIUBING COMPANY LIMITED, ENGLAND MAGNET com;

Re Drawing. magma meaxmn as, 1931, semi x0. sas asa, ln Great 3mm a1, 1950.

The present invention relates to the construction of magnet cores and is particularly concerned with cores which are made fromfinely divided material by the ap lication Such cores fin considtype used on telephone'lines where their special magnetic properties are particularly advantageous; The invention, moreover, may

1 be considered as an improvement in or modification of that set forth in my application,

Serial No. 424,738 filed th January 1930- which relates to a process for producing the finely divided material by drawing it into wire of very small diameter which is then cut up into short lengths.

The improvement according to the invention consists in that the material is, utilised in the form of tape rather than the form- 15: of wire, that is to say instead of having a circular section it has a section of which one dimension is considerably greater than the other. Thechief advantage of this form of construction is that by the substitution. of

' tape for wire the h steresis and eddy current losses are consi erably reduced.

2. The methodof making" magnet cores which consists in drawing magnetic material ofnickel-iron alloy into'the' form of a'wire,- passing the wire through rollersto flatten the same into the form ofa tape cutting the tape into shortvl'engt hs to form at articles ofthe material, insulating the. partic es from one another, magnetically ali ing the par? ticles sothat their axes lie in t e same direction, and then subjecting the mass to pressure to consolidate the same.

In testimony whereof I afiix my signature.

PHILIP NoR'roN'Ros BY.

The tape may be-produoed by including Y an additional step in the rocess previously described whereby the nlckel-iron wire is passed through rollers so as to'flatten it out either before or after it reaches the cutting machine, or alternatively the tapemay "a: manufactured by a separate'process. The

JOCGSS for the actual manufacture of the cores may be as described in the application above referred to and referably also includes the process descri ed in m apphcation Serial No. 498,694: filed 28th 0vember 1930 by which the particles are align as to have their axes in the same. direction. What I claim as new and desire to secure by Letters Patent is:

I. The method of making magnet cores :hich consistsindrawing magnetic material .ltQ the form of awire, flattening the wire to the form of a tape, cutti :.;ert lengths, insulating -t e short flat lengths of material from one another, and "-msolidating'the same into a mass by presare.

the tape into CERTIFICATE or CORRECTION. i semembrz'o 1932.

I I I lIl l LIP NORTON ROSEBY.

.It is herehy certified that the ,name'of the assignee inthe sbovenumbered fpatent was erroneously described and specified as "Automatic Telephone Menu lecturing Company-Limited", whereas said natne should have been described and I specifiedas Automatic Electric Company',iLimited, is shownby the records of I v assignments inthis office; andthat the saidLetters Patent should be read-with thiscorrectiontherein that the same may conform to the record of thecase. in

the Patent, 0llice. 1

Signed and sealed'this 29th day of November, A. D. 1932. Y l

' V J 'MJJ. Moor e, (Seal) j H Acting Commissioner of Patents.

ceRTmw/m: 0F CORRECTION. f

'Patent'NoT1,878,713. v September 1932. i

'PniLm oRToN. ROSEBY.

' j- ,Itis hereby certified that the name'of the assignee inth'e aboyenumbered 4 'patent was erroneously described and specified as "Automatic Telephone Mann facturing Company-Limited", whereas said name should have been described and 1 specifiedas Automatic Electric Company, 'Limited, as shown bythe records of w assignments in'this office; and that 'the'saidletters Patent should be 'read withthis -correction.therein that the same may conform to the record of the-case, in the Patent Office. I

Signed and sealed'this 29th day of November, A.1D.- 1932. 9 n

' (Seal) I 7 ."Acting Commissioner of Patents. 

